\section{Requirements for Avionics} % (fold)
\label{sec:Requirements for Avionics}

\begin{table}[ht]
  \small
  \begin{tabular}{p{3.5cm} p{3cm} p{2cm} p{5cm} }
	\toprule
	\textbf{Function} & \textbf{Estimated Specification} & \textbf{Value*} & \textbf{Processor Requirement} \\
	\midrule
	3 orthogonal gyroscopes & $\pm$30$^\circ$s$^{-1}$ & 1 & 3 high resolution analogue inputs or digital interface \\
	3 orthogonal accelerometers & $\pm$1G & 1 & 3 high resolution analogue inputs or digital interface \\
	GPS & Works to 30+km & 1 & Asynchronous serial interface \\
	Real Time Control & up to 100Hz control loop & 1 & Fast floating point performance \\
	Data Logging & up to 10kbps & 1 & SPI or SD interface port \\
	Timing & 1ms resolution & 1 & Hardware Timers \\
	Pyrotechnic Firing Circuits & 2 off high current channel & 1 & 2 digital output pins \\
	State Estimation & 6DOF inertial sensor fusion & 1 & Fast floating point performance \\
	Magnetic Sensor & 1DOF yaw magnetic & 1 & 1 high resolution analogue input or digital interface \\
	System status feedback & Indication/debug LEDs & 2 & 2-4 digital outputs \\
	Telemetry downlink & 434MHz 10mW & 1 & Digital/Analog Converter \\
	Telecommand uplink & & 3 & Radio Receiver/Transceiver \\
	Motor Actuation & 4-6 PWM channels & 1 & PWM ports \\
	Barometric Pressure Sensor & 1mBar resolution, 0-1Bar & 3 & 1 high resolution analogue input or digital interface \\
	\bottomrule
	\end{tabular}

\caption{Interface and other requirements for the `Hobble' avionics system. Compiled in collaboration with Fergus Noble. *key: 1 - Essential; 2 - Highly Desirable; 3 - Desirable}
\end{table}

\newpage
\section{Electronics Schematic and Layout}
\label{sec:layout}
\subsection{Layout} % (fold)
\label{sub:Layout}
% subsection Schematic (end)
\begin{figure}[ht]
  \centering
  \includegraphics[width=\textwidth]{hobble/b2layout.png}
  \caption{The PCB layout of the main flight computer}
  \label{fig:b2layout}
\end{figure}

A thumbnail view of the schematics can been seen on the next page. The full schematics eagle file can be downloaded from the CUSF website.
% section Requirements for Avionics (end)
\includepdf[nup=1x3,pages={1-3}, frame=false, noautoscale,scale=0.3]{hobble/badger2.pdf}
\includepdf[nup=1x3,pages={4-6}, frame=false, noautoscale,scale=0.3]{hobble/badger2.pdf}

